From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph chart recording of a battery discharge test with handwritten calculations.
| Identifier | ExFiles\Box 22\1\ Scan262 | |
| Date | 22th July 1925 | |
| 22-7-25 Fco, [torn]uiza battery 103 lbs Average amperes = 6.48 Hours = 14.75 Ampere hours - 95.6 -930. 1.80v REG'D TRADE MARK 'MEGGER' | ||